The past decade has seen an extensive empirical reassessment of the in
formation content of financial market variables sensitive to monetary
policy. Particularly provocative are recent papers suggesting that som
e interest rates and interest rate spreads contain more information ab
out economic activity than monetary aggregates. This paper reviews imp
ortant methodological pitfalls in these studies. We then show that non
e of the commonly employed measures of monetary policy contain increme
ntal information useful in forecasting real economic activity. Two con
clusions are possible. Either monetary policy innovations have no sign
ificant real effects, or we (collectively) have failed in our efforts
to measure monetary policy. (JEL E52).